Does this girl use a soother at all? Someone told me to try (when I had a biter in care) attaching a teething ring to their shirt and directing them to bite that when furstrated, but it didn't work for me. My biter used a sooter at naptime, so out of desparation, we tried clipping it to his shirt and letting him have it all the time. It worked! He had the soother for about 2-3 weeks and stopped biting adn then we were able to ween him from the soother and he did not start biting again. I had warned his parents that I may have to terminate as I couldn't keep sending other kids home with bite marks. If all else fails, you may have to terminate.